It was April, 3rd 2014 when Anders Hejlsberg, father of the C# language, got on stage during the keynote at the Build conference in San Francisco and released the .NET Compiler Platform (“Roslyn”) as open source and made the first pull request. That same keynote, Scott Guthrie, Executive Vice President of Cloud & Enterprise group and one of the original creators of the ASP.NET web stack, announced the creation of the .NET Foundation. This was a pivotal point in .NET’s open source journey which spawned the avalanche of releasing software as open source at Microsoft. This is the story of the .NET Foundation.